Combined swimming pool and amphitheater



R. i A TToRNEYs.

Jan. 3l, 1928.

J. F. WHITMAN COMBINED SWIMMING POOL AND AMPHITHEATER Jan. 3l, 19.28.

J. F. WHITMAN COMBINED SWIMMING POOL AND AMPHITHEATER Filed Sept. 28, 1925 5 Sheets-Sheet 2 Jan. 31, 1928. 1,657,598

J. F. WHITMAN COMBINED SWIMMING POOL AND AMPHITHEATER A TTORNEYS.

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Patented Jan. 31, 1928,

JOHN FRANKLIN WHITMAN,

PATENT OFFICE.

or BROOKLYN, NEW YORK.-

COMBINED SWIMMING POOL AND AMPHITHEATR.

Application filed September This invention relates to a combined swimming pool and amphitheater .and more particularly to a structure in which, when the pool is partially or wholly drained, a portion ot the pool may be used i'or exhibi tion purposes and the floor ot the rest ci the pool may be used to accommodate the spectators.

An important object ot the inventlonus to provide a novel structure which can easily be converted into proper form tor use either as a swimming pool or an amphitheater.

ln carrying out the i vention, provision mayT be made ot a structure ot this kind in which there is a deep pool insidethe main pool and spaced trom the walls so that, when there is water in the deep pool only, the floor ot the shallow portion of the pool may be used tor seating space, the `downward slope ot such floor towards the deep pool tending to give a good view ot the deep pool when used for diving contests and contests ci the same general nature.

iliccording to another application of the invention the deep pool may be covered by members such as planks to form a plattorni ot' which the central portion may be used as an arena ior boxing bouts and the like and the surrounding portions of the platform may be used to accommodate ring side seats to increase the seating capacity.

Other important objects ot' the invention are to provide a structure ot the kind speci lied in which there are openings, at suit-- able points in the enclosing wall, closed ivater tight by bulklicads removable to open the ends of corresponding aisles starting trom said openings; an arrangement ot the floor relative to surrounding promenade so that at one of the openings the corre3ponding aisle .is substantially level with the promenade at its outer end and slopes dow wardly theretroin toward the deep pool, and at the other openings the outer ends otthe aisles are at one or a 'plurality ot steps down, additional steps being formed in the enclosing wall at such openings; a construction in which there is a pipe 1Srench for the main pipes ot' such systems as a skinnncr system tor cleaning the surface water, a water vacuum cleaner system t0 remore sediment 'from the bottom of the pool and a water su-ply and circulation system; means tor draining the scum gutter ot the shallow pool into the pipe trench; means as, 1925. serial No. 59,054.H

'for draining the promenade directly into the pipe trench; independent water supply systems ior the deep and shallow pools; a scum gutter for the deep pool affording a support for a cover of the deep poolg'and means for filling and draining the deep pool.

Preferably the combined swimming pool and amphitheater proper is part ot' a structure arranged tor permanent seats around the swimming pool and amphitheater which may be designed for use tor circus per torinances, horse shows, etc. To prepare the empty pool for such purposes the deep pool is covered and the shallow pool floor and deep pool cover are covered with a'protect-ive layer of suitable material such as sawdust. The entire pool then becomes an arena and for circus exhibitions the cover' of the deep pool may be usedto accommodate one or more rings and one or more platforms or squares and the Surrounding portion of the licor may be used for the usual parades, chariot races, etc. Y

Ordinarily both the shallow and deep pools are kept full in summer and empty during the winter when, the deep pool being kept covered, the whole pool is used -tor `athletic exhibitions, circus performances,

horse shows, etc. lVhen, however, during the period when the pool is arranged tor sports-other than'swimming, it is desired to have diving exhibitions, the cover is taken oli the deep pool and the latter is filled with water.

In the summer period while the entire pool is full, such diving exhibitions in the deep pool are usually given without draining the outer pool. Although considerable expense would be involved in draining and refilling the shallow portion ot the pool, there might be occasions during the su1nmer period which due to .the prices charged for tickets might make it worth while to drain the shallow pool to provide additional seating capacity tor diving or similar exhibitionsor tor exhibitions given on the cover ot the deep pool. l

Other features and advantages will hereinatter appear.

In the accompanying drawings:

F ig. l is a plan viewl illustrating at one end the appearance ot thestructure when used tor a `swimming pool and at the other end the appearance ot the structure when used as an amphitheater; certain underlying parts of the periphery being indicated in displaced position along one-halt ot the periphery tor greater elearness;

Fig. 2 is ay vertical section taken alongthe longitudinal axis ot Fig. l;

Fig. 3 is a sectional view showing one ot the removable bulldieads in ettective position; i

Fig. Ll is a schematic sectional view at the edge oit the shallow pool;

Fig. 4f* is a sectional View illustrating the manhole construction.

Fig. 5 is a schematic vien' similar to Fig. 4 but illustrating a inodilied structure;

Fig. G, is a sectional view illustrating teatures ot the deep or diving pool; and

Fig. 6 is a section taken on the line tid-6 ot Fig. 6.

As illustrated in Fi g. l, the combined swimming pool and amphitheater comprises a pool l separated by a Wall 2 troni a. sui rounding promenade and including an inner deep or diving pool Ordinarily the pool l is kept substantially itull. but, when it is desired to give exhibitions such as bore ing matches, the shallow portion is lett empty, the diving pool is covered as hereinafter descriliied, and seats are supplied as indicated at the lett in Fig. l. Alsoit the diving pool fl.- only is to be used tor exhibition purposes, the surrounding shallow portion may be let't dry and utilized for seating purposes.

The surrounding Wall 2 is provided with a scuni gutter 6 ot which the inner Wall T projects inwardly beyond t-hetop ot' the main wall and serves as a tootV rest tor persons sitting on the top ot the wall. Preferably the top of the Wall 2 projects over the scum glitter G and forms an automatic wave -return 1l as Well as a shield for the scum gutter. Water entering the scum gutter is drained through pipes 8 into a pipe trench 9 (F ig. l) and linallv through drains 10 at the bottom ot the trench. The floor or bottom of the pipe trench is arranged so that the drains 10 are at points Where the floor is lower than at intermediate points,thus assuring suitable drainage. The variation ot elevation et the lioor at ditl'erent points along the pipe trench is indicated by breaks 10 in the concrete structure.

As indicated in Fig. 2, the tloor ot the pool 1 comes up at one end to substantially the level ot the promenade, at the other end to one step belenT suoli level, and at intermediate points to tivo or more steps below such level. When the structure here illustrated is to be used as an ainphitlnaiter, the Wall is opened at both ends and at three intermediate points on each side.

At the inain entrance l2, the aisle 13 starts at the level ot the promenade and slopes downwardly toward the adjacent end ot the deep pool 4; at the opening 14e at the other end et the pool the aisle l5 is one step down troni the level ot the promenade and at the side openings lo', li', ld, l5), 2() and 2l, the corresponding side aisles 22, 23, E24, 25, 26 and 27 are two steps below the promenade, a step being provided in the wall at each ot such side openings as indicated in Fig. 2. A corresponding step 25: may also he provided in the wall at the opening let.

lllhen the pool isin use all ot the openings l2, lll, 16, 1T, t8, il() and 2l are closed by suitable bulkheads 30, as illustrated in Fig. 3 'tor one ot' the side openings at 'which a step 28 is provided. .ttt the openings in the wall 2, provision is made ot trames 3l ont suitable material such as iron anchored in the structure ot concrete or like material by members 32 otl Awhich angle portions are buried in the concrete and other portions are secured to portions oil the iron traine.

To enable 'rater tight closures to be et tected, gaskets lil ot suitable material suoli as rubber are interposed between the trames i and the removable hulldieads l0 and screws Eid passed tlnfough openings in the lnilkheads .Elli tpre'terably ot steel) and gaskets and screwed into said trames 31. As shown in Fig. 2:3 each lulllihead 30 is provid ed with a false scum gutter 55 and an automatic wave return 3G.

For Water supply and circulation, provision is made ot a pipe 37 supported in the pipe trench by brackets 38 set in the concrete wall, and ot pipe lines 3S) leading to in let nozzles l0 arranged at di'lferent heights around the pool, preferably at points inidway between the Water level indicated at il (Fig. fl) and the tloor ot the pool. The in let nozzle ll() shown in Fig. il is approximately at the middle ot the pool at one side thereof and the other nozzles would be successively liighcr toward the shallow end ot the pool (the bottom at such end being indicated by the line l/l) and also towards the deeper end et the pool (the bottom at such end being indicated by the line 112i). Pret erably all inlet nozzles point twvard the center and all pipe lines 3.0 are provided with valves 39".

The supply and circulation oit water in the diving pool may be ell'ected in the saine general ay as described tor the shallowl portion et' the pool. To this end provision is made at the right hand end olA the diving pool (Fig. l) ot water inlets aft supplied by a pipe line tilt Preferably th inlets are located near the top oi' the diving pool. The diving pool is provided at tivo depressed portions et its bottom with two sun'ips d5 covered by grills flo set in suitable trames. These sunips are connected to an outlet pipe line i7 connected with a suitable pump (not shown). ',lhe d ecp pool is alsow provided with a senin gut er e8 connected by pipes 49 with a drain pipe 50 which is controlled lll() by a suitable valve 51 which may be in any convenient location. The inner iva-ll of the scum gutter 48 may be used as a support for the cover 52 Which may be made up ot planks or the like.

Also mounted on brackets in the pipe trench 9 is a pipe line of a vacuum cleaner system and at a plurality ot points around the pool pipe lines 551., preferably having valves 51151, are provided for connect-ing the pipe line with nozzles to which may be attached vacuum cleaner devices (not shown) for removing sediment and the like from the bottom of the pool. F or skimming the surface of the Water iny the pool provision is made at suitable intervals ot lflat fanshaped nozzles 56 each connected by a pipe line 57 and a valve 57 with a main pipe line 58 mounted on brackets in the pipe trench.

To cover the pipe trench 9, use is made ot slabs 59 of reinforced concrete rest-ing on ledges 59 in the concrete Walls of the pipe trench. Between the ends ot successive slabs are placed manhole trames 60, which may be of suitable metal, and manhole covers 61 lorn'ied of central plates and Yframes litting into said frames 60 and projecting above the central plates to such an extent that their upper edges are substantially flush with the upper edges ot the ramesGO and with the upper faces ot rubber tiling 62 on 'the promenade Hoor and on said covers 61.

During' the use ot the pool considerable Water drains on the promenade floor from bathers standing; or Walking thereon or sitting on the coping or top of the Wall 2. To enable this water to drain Yfreely into the pipe trench provision is made of suitable openings near the inner edges o'l' the main hole covers 61 and coveredby perforated plates 63. The rubber tiling; is also cut away above said opening so that the Water from the promenade drains freely there through. later 'from the copingv also runs down on the inner side thereoi1 and, due to the fact that the inner tace ot the copinp` is oiiset outwardly from the inner 'ace ot the inner Wall ot' the scum gutter, drops directly into the senin gutter.

lt should be `imderstood that a constant circulation ot Water in the pool is etllected by drawingout Water through the sumps and pipe line et? and returning' it through the inlets 50 ot the shallow pool portion or the inlets 44k ot the deep pool portion or through both sets oil inlets at one time. Preferably provision is made of a. ina-in punrp for use when the shallow pool is in use and ot' a separate pump for use -With the deep pool only, and the operation ot the main pump is such that the water in the whole pool is completely changed in six hours. letore the Water drawn out through the pipe 4T is restored to the pool, it is treated to bring it into the condition of ocean water in the corresponding latitude by passing it through salt tanks; it is ltered in connection with a treatment for coagulation; it is pass-ed through heatersto temper or heat the Water to the proper ternperature; it is passed through an ultraviolet ray sterilizer; and Ait is treated With chlorine b v material trom a chlorinator fed into the main receiving the water trom said ultra-violet rav sterilizer. Such apparatus is more l'fully disclosed in my prior application hier. No. 734l,547 `liled Aug. 27, 1924, (patented January 1926, No. 1,568,117). For convenience in placing the chairs, the concrete floor ot the shallow portion of the pool may be marked (Fig. 1) to outline the aisles and thereby determine thelocationA ot the seats. Preferably such marking is obtained by the use ot strips or insets of concrete ot ditl'erent color troni the rest of the jtloor. Exposed portions ot the structure, such as the scum gutter and the inner surfaces ot the Walls ot' the pool, may be covered With suitable tiling. The reinforcement ot the concrete may be eiiiected by members 65 as indicated in the various iigures. i

Attaching devices 66 tor steel supports 6T ol suitable divine; structures are provided at suitable intervals around the deep pool and provision is made at different points in the bottom ot the pool ot eyes or inserts 66 located below the surface of the floor and adapted for use in connection with removable athletic apparatus.

Ladders 69 such as shown in Fig. 6, may be provided in the Walls of the deep and shallow pool portions. rlhese ladders which are ot vcement or like construction are sanitary and are set in the Wall so as to be substantially i'iush With the wall and thereby decrease the chance or' accident by striking the saine.

ln the modilied structure shown in Fig. 5, provision is made ot special drain pipes 7() for the promenade. rllhese pipes have at their upper ends grids 70EL in the floor ot the promenade and receive the drainage troni the scum ,gutter through pipes 71.

is indicated in Fig. 1, the skimmer pipe line 58 is supplied with Water through an inlet 272; the water supply pipe'l receives Water through an inlet 73, and the vacuum cleaning pipe 52 is connected With the pump through a pipe Tl.. lt should be understood that the drainage from the pipe trench through the drains 10 may be carried off in any suitable manner.

Structures built accordingl to the present invention may vary widely as to size, but lor illustrative purposes the dimensions ot' an approved structure will be given. The inner dimensions ot the main pool 1 are length, 196 feet, 7% inches, and breadth,

lis

87 feet, 5 inches; and those of the diving pool el are length, l5 liest, and breadth, feet. When the deep pool is covered, the seats are so arranged as to leave a space ill teet square, thus prtnfiding lor an arena 2l feet square for boxing and other purposes and a passage 5 'lect Wide on each side ot said. arena.. The main or end aisles are 5 feet wide and all oit the other aisles are 4 feet Wide, with the exception olf the short aisles leading diagonally to the corners of the arena, such aisles being- 3 feet Wide. The bulkheads 30 are of ditlierent lengths, such as t tent, 8 teet and l2 4leet, to correspond with the various widths ot openings. ln such large concrete structures it may be necessary to provide expansion joints as shown at 7T on Fig. 6.

As shown in Fig. 3, the lower edge ot each bulkhead rests on a ,ledge 78 ot tile projecting beyond the trame 3l. Pre l'erably there is the same arrangement at all ot' the side openings in the wall Q. At the end openings, however, no such ledge exist-s and it is found zulvantageous to provide in the concrete iioor a groove (not shown) to rcceive the lower edge oi the bulkhead.

As shown in Fig. 3, the opening over the step is covered, when the bulkhead is in position, by a plate 79 secured in position by screws 8() "passing theretlnrough and threaded into ears or lugs 8l secured to the bulkhead. Also secured to the plate T9 by screws S0 is a l'lange which rests against the inner li'ace ot the Wall above the intormediate step. The plate 79 may serve to some extent as a brace ttor the bulkhead but its principal service is to cover said opening. The advantage ot placing the step 2S in the wall is evidentinasmuch as il? a per manent step were placed so as to project into the pool there would be considerable danger that bathers would be injured by striking the saine.

Although the bulkheads 30 may be constructed in different ways, the form shown in Fig. 3 is preferred. In this form there is a vertical web Se curved outwardly to form the false scum gutter 35, then extended vertically up y*ard to substantially the height olf the Wall. and then outwardly to 'forni a flange 85. lllounted on the 'flange 85 is a coping in the form oit an inverted channel member S6 secured to the web tl-l by screws Si' passing through the channel member 8G, the `flange, and the gasket 33, and threaded into one or more members 8S.

To clean the bottom oi the pool use is made ot the vacuum pipe line connections and nozzles lllhen any one `nozzle 55 is to be used, an attendant reaches down beneath the surface oit the water and unscrews a. cap (not shown) and attaches `the tube ot a suction cleaner (not shown) which is handled from a boat and serves to clean the bottom oi the" pool over a segment of :i circle ot which the radius is determined by the length ot the tube. The suction cleaners or nozzles used i'or this purpose may be substantially the same as those used for household purposes in buildings provided with vacuum cleaner systems.

nt suitable times` preferably after use ot the suction cleaner, the skimmer system is used to clean the surface olf the water of any 'aste material. The skimmer nozzles 56 are on one side ot the pool and When they are in use additional water may be sujiplied, the sui-tace Water overflowing into the scum gutter on the side opposite the skimmer nozzles 56.

Vilhen it is desired to use the structure for exhibition purposes the water withdrawn by draining through the sumps 4:5 and the pipe line a7. lt diving exhibitions are to be given, the water kept at the level ol" the deep pool scum gutter, the valve 51 being open atI the time to permit drainage through the scum gutter. Usually, however, during the winter season the Whole pool is lcptdry and chairs are arranged on the floor ot the shallow pool portion in accordance with the markings on the loor. The bulkheads 30 are, of course, removed to give access to the aisles. Then the exhibition is, ttor example, a boxing contest, the seating is continued over a portion of thc cover lcaving;- a boxing ring S3 surrounded by an aisle.

To restore the structure to condition for using the Whole pool, the cover 52 is removed and all oi the bulkheads are placed in position in the Wall 2. Then the valve til is closed to prevent the escape oli' water through the deep pool scum gutter and Water admitted through the various inlets until the pool is lilled.

The foregoing detailed description has been given tor clear-ness of understanding, and no undue limitation should be deduced therefrom, but the appended claims should be construed as broadly as possible, in view ot the prior art.

Having thus described my invention, l claim:

l. In a combined swimming pool and amphitheatcr, a deep central pool portimi hat ing substantially vertical walls of sullicient height to permit diving, and a surroundingI shallow pool portion of `which the bottoni slopes outwardly and upwardly from the top of the deep pool portion and serves as the l'loor of the amphitheatcr when the water level is snlliciently low as to bare the bottom ot the shallow pool portion While leaving suiiicient water in the deep pool portion tor diving.

In a combined swimming pool and ainphitheater, a deep central pool portion, a surrounding shallow pool portion ot which lill lun

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the bottoni serves as the loor of the amphitheater when the water level is sufficiently low, said door beingso constructed that aisles indicatin1 the seating` arrangement are outlined by-lioor material ot' different color from that ot the adjacent floor material, a Water retainingl wall surroundingl said shallon7 pool portion and having opei'iinps at the ends of certain ot said aisles.` and means including shit'table bulkheads for el'llecting a Water tight closure ot' said openings.

3. In a combined swimming` pool and am phitheater, a deep central pool portion, a surroundin;l shallow pool portion ot which the bottoni serves the floor ot the amphitheater when the water level is suii'iciently low to leave such floor uncovered, and separate Water circulation systems `tor said deep and shallow pool portions.

4. In a combined swimming pool and ainphitheater, a deep central pool portion, a surrounding' shallow pool portion ot which the bottom serves as the floor ot' the amphitheater when the water level is sulliciently low to leave such floor uncovered, and a wa ter circulation system including a portion for use with the deep pool portion only.

5. In a combined swimming pool and ainphitheater, deep central pool portion, a surrounding shallow pool portion of which the bottom serves as the floor ot the amphitheater when the water level is suiiiciently low, a scum gutter surrounding the deep pool for use When the deep pool only is in use, a drainage system tor said scum gutter, and means to prevent the flow oi water troni said scum gutter when the shallow pool is `in use` 6. In a combined swin'iming pool and amphitheater, a deep central pool portion, a surrounding` shallow pool portion of which the bottoni serves as the floor of the amphitheater when the water level is suliiciently low, a scum gutter for said deep pool portion having an upwardly extending` outer wall and a loWer interior wall to determine the Water level tor the deep pool portion and serve as a support for a cover for said deep pool portion.

7. In a combined swin'uning pool and aniphitheater, a deep central pool portion, a surrounding shallow pool portion of which the bottoni, when the water level is snliiciently low, serves as Jthe Hoor of the aniphitheater with seating room extending; entirely around the deep pool port-ion, a. promenade surrounding Vsaid shallow pool portion, and a' Water retaining,l wall surrounding said shalloW pool portion and separating' the saine and the amphitheater iioor trom the prome-` nade.

8. In a combined mvirrniiiiigl pool and ainphitheater, a deep pool portion having' a Wallrising abruptly from the hottom thereof and of sufficient height to permit the deep pool portion to be used for diving, a snrrounding shallow pool port-ion ot which thebottom extends outwardly and upwardly troni the upper edges otl the wall of the deep pool portion and, wl en the water is sutliciently lon7 to leave the same uncovered, serves as the AHoor ot the an'iphitheater with seatingroom extendingb` entirely7 around the deep pool portion, and a cover for said deep pool portion to provide an arena.

9. In a combined swimming pool and amphitheater, a. deep pool portion having the upper portion ot the surrounding wall oset outwardly to provide a Lgutter extending,` entirely around said deep pool portion beneath the top of said wall, a shallow pool portion surrounding the deep pool portion and having `a bottom which, when the water is sufficiently low to leave the same uncovered, serves as the floor ot the amphitheater with seating rooin extendingentirely around the deep pool portion, and a cover for the deep pool port-ion resting on inner wall ot said gutter and providing` additional seating room as well as a central arena or exhibition space.

10. In a combined swimming pool and amphitheater, a deep central pool portion, a`

surrounding shallow pool portion, of which the bottom, when the water level is sulliciently low, serves as the floor ot the amphitheater with seating capacity entirely around the 'deep pool. portion, a promenade surrounding said shallow pool portion, a water retaining Wall surrounding said shallow pool portion and separating the saine and the aniphitlieater licor from the promenade, and bulkheads 1n said wall removable to permit access to the Outer edge of the amphitheater floor.

1l. In a combined rnvin'nning` pool and amphitheater, a peripheral promenade Hoor, a water-retaining wall at the inner edge of sai-d promenade floor, a main pool bounded by said wall and comprising' an inner deep portion of which the upper edges around the whole periphery thereof are spaced from said wall and a shallow pool portion completely surrounding the deep pool portion, the ioor of the shallow portion serving as the iioor of the amphitheater when the water level is sufficiently low and being` so shaped relative to the promenade floor that at one end the Vfloor of said shallow portion is substantially on a level with the promenade Hoor and at the other end is one step down, and bulkheads adapted to close openings at said ends and removable to permit entrance and exit at said ends to the amphitheater floor.

12. In a combined swimming pool and amphitheater, a peripheral water retaining4 wall, a main pool in which the water is normally maintained at such a height that said wall serves to retain the water therein, said main pool comprising; a deep central portion and a shallow portion between said deep portion and said wall, and having a downwardly and centrally inclined floor adapted for use as an amphitheater when the water level is suliiciently low, water circulating means for said shallow portion includinfr inlets midway between the bottom and the normail water level and separate water circulatinfr means tor the deep pool includingT inlets near the upper edges of the sides thereof.

13. In a combined swiinminoj pool and amphitheater, a peripheral promenade door. a main pool compri sine,r a deep central porti on, an outside *all separating.;- the main pool from the promenade. a shallow portion bounded liy said outside wall and having a floor inclined inwardly and downwardly toward the deep pool portion and so related to the plane o'l' the promenade floor as to be substantially level therewith at one end, one step down at the other end and two steps down at intermediate points, and water snp-- ply and circulating means includingr a plurality of inlets arranged around the inside wall substantially midway, in each case. between the bottom of the pool and the normal water level.

14. In a. combined su'nuuing pool and amphithoater. a peripheral promenade door, a water-retaininea wall at the inner edge of said promenade floor, a` main pool bounded by said wall and comprising an inner deep portion oit which the upper edge around the whole periphery thereof is spaced from said wall and a shallow` pool portion completely surrounding the `deep pool portion.` the iioor of the shallow portion servingi as the floor of the amphitheater when the water level is sufficiently low and beine' so shaped relative to the promenade floor that at one end the floor of said shallow portion is substantially on a level with the promenade floor, at the other end is one step down. and at an inten mediate pointalone; the side is down two steps of which the intermediate step is formed in the wall. and bulklieads adapted to close openings in said wall at said ends and intermediate points and ren'iovable to permit exit and entrance at such points.

15. In a combined swimmilm pool and am phitheater, a ijiei'ipheral promenade Hoor. a wall servingr to demark the ampliitheater from the promenade and as a retaining' means for water in the swimming pool, a floor for the amphitheater serving` as the hottom of the swimming; pool, and bulkheads in said wall removable to open the ends ot main and auxiliary aisles the floor of the amphi theater being inclined downwardly on all sides toward the center thereof and being so related at its periphery to the plane of the promenade floor that the outer end of the main aisle is at substantially the level oi the promenade 'floor and the outer ends ol" the auxiliary aisles are down one step 'formed by the water retaining; wall or down two steps, an intermediate step being formed in said Wall below the level, of: the promenade floor.

16. In a combined swimming pool and amphitheater, a peripheral promenade i'loor. a wall serving to denial-li the ai'ilpliitheater from the promenade and as a retaining means for water in the swimn'iing pool, a floor itor the amphithcater serving as the bottom of the swimming pool and lnrvingr aisles marked therei'in, said floor of the a1nphitheater and hot-tom oil the swin'iming pool. being inclined downwardly toward the center thereof and being so related at its peripha ery to the plane ot the promenade that the main aisle at said periphery is on a level with the promenzule tioor and diierent aux iliary aisles are respectively one and two steps down, the upper step hemp` at the level oi the promenade andthe intermediate Stein where one is used, beingr in said wall, anda diving `pool located centrally ot the main pool.

li". In a combined swinuningpool and aniphitheater, a peripheral promenade tloor, a

Tall serving' to demarl; the amphitheator trom the promenade and as a retaining means ttor water in the swimming pool, a floor for the amphitheater serving' as the bottom of the swimming; pool, said floor of the amphitheatin' and bottom ot the ewimu ming pool heini,T inclined downwardlir toward the center thereof and having?T its periphery so related to the plane of the promenade that the main aiele at said periphery is on a level with the promenade floor and diilerent auxiliary aisles are respectively one and two steps down, the up per step heine` at the level ot the proii'icnade and the intermediate step'. where one used. being in the wall. and a stage or arena centrally located in said amiihitheater.

18. In comhination, a, swimininglr pool, u water retainingr wall surrounding the saine. a scum gutter at the inner face o'l said T:dll drainage means for said scuingutter extending to the outer side ot said wall, and a pipe trench surrounding1 said pool at the other side ot said wall and receiving the senin PQuitter drainage through said drainage means. i

19. In combination. a enin'iming pool`-` a water retaining wall Surrounding the same, a senin gutter at the inner face ot enid wall.` drainage means 'tor said .f-cum gutter entendingr to the outer side of said wall, a pipe trench surroundingsaid pool outside ot' said. wall and receiving' the scum gutter drainage trom said drainage means, the door oi said pipe trench varyingr in elevation to provide low portions to which water in the pipe trench wfll drain. and drains atsuch low portions ot the pipo trench tloor.

20. In ron'ihination` a swimming pool. a water retaiuino wall surrounding the pool. a pipe trench surrouinling the pool outside lll) liti` -lll of said wall, means tor draining the pipe trench, and a promenade floor surrounding said vvall and comprising" slabs extending over the top ot' the pipe trench and devices between successive slabs adapted to permit the water on the promenade floor to drain into the pipe trench. I y

2l. In combination, a swimming pool, a water retainingl wall surroni'iding the pool, a pipe trench surrounding t-he pool outside ot said wall; means for draining the pipe trench, and a promenade floor surrounding said wall and comprising a row of slabs eX- tending` over the pipe trench, and cover members between said slabs and formed near their innery edges withy drain openings through which water will drain from the promenade :lioor into the pipe trench.

22. In combination,V a swimming' pool, a water retainingl wall surroundinp` the pool7 inlets in said wall arranged at intervals around the pool7 a pipe trench around said pool outside ot said wall, a water supply pipe line in said trench and extending around said pool, individual connections between said inlets and said pipe line, and a valve in each ot said connections and located in said pipe trench.

23. In a swimming pool. a peripheral water retaining' wall. a bottom ork 'door so arrangedthat the depth ot the pool varies at different points of the periphery? a row ot inlets in said wall arranged at intervals around the po-ol and generally midway between the normal water line and the bottom of the pool. and a water supply svi/istem connected with said inlets.

24. In a combined swimming; pool and' amphitheater, a peripheral promenade tlooi"1 a water retaining` wall at the inner edge ot said promenade floor. a pool bounded by said Wall and comprising' a deep central portion and a surrounding shallow. portion having a Hoor inclined inwardly and downwardly toward the deep pool portion and so related to the plane of the promenade tloor as to be substantially level therewith at one point, and bulkheads normally closingl openings in said wall at dilierent points, including' the point at which the pool `floor is level with the promenade floor` but removable to permit ent-rance to the pool when the 'floor of the shallow portion thereof is available for seating purposes.

25. In a combined `swimming' pool and aniphitheater` a peripheral promenade tloorq a water retainingl wall at the inner edge ot said promenade door and having' openings at convenient points. means including bulliheads normall,v closing; said openings a main pool bounded by said` Awall and coi'mprising an inner deep pool portion ot which the upper edge around the whole periphery thereof is spaced from said wall and a shallow pool portion completely surrounding the deep pool portion, the licor ot the shallow portionserii'mg; as the floor of the amphivtheater when the water level is sullicientlj.7

low and being' so shaped relative to the promenade floor that at one el' said openings the door ot' the shallow pool portion is substantially on a level with the promenade floor and at other openings down a plurality of steps below the promenade floor, the intermediate steps being termed in the wall.

26. In a combined swimming pool and amphitheaterl`v a peripheral promenade floor, a wall serving to demark the amphitheater trom the promenade and to retain water in the swimming' pool. a floor ttor the amphiltheater serving as the bottom vet theswimming pool and bnlkheads in said wall removable to open the ends ot main and auxiliary aisles, the floor of the amphitheater being inclined downwardly on all sides toward the center thereof and beine,` so related at its periphery to the plane oi the promenade floor that the outer end of a main aisle is at substantially the level of the promenade iloor and that the outer ends of other aisles are at levels differing trom that of the promenade floor by a plurality ol steps.

27. In a combined swimming' pool and amphitheater, a peripheral promenade Hoor. a wall at the inner edge ot said promenade tloor having passages therethrough, bulkheads normally closing said passages, a

deep central pool portion, and a surrounding" shallow pool portion bounded by said wall and having' al bottom which serves as the 'door et the amphitlieater when the water level is suiiicient-ly low and is so related at its periphery to said promenade Hoor as to require steps in said wall at certain of said passages.

28. In a combined swimming pool and amphitl'ieater, a peripheral promenade floor, a deep central pool portion`r a surrounding shallow pool portion having); a bottom which serves as the floor of the amphitheater when the water level is sui'ticiently low and is so related at its periphery to said promenade floor at a plurality ot passage points as to require steps tor convenient passagetrom one to the other of said floors at certain of said points, a water retaining wall separatingl said shallow pool portion from said promenade floor and havingl therein openings at all ot said passage points and steps where required, bulkheads normally closing said openings and comprising in each oase a. generally vertical web portion at the inner sin-tace oi" said wall and a top ot the same width as said wall, and plate members covering; said steps at the level of said promenade floor when the bulkheads are in position and secured to the bulkheads. 29. In a combined swimming` pool and amphitheater,v a periiliiheral promenade tloor,-

a pool enclosed thereby and having a bottom :0 serve as tlie oor of :in amphitheater when said promenade from said pool and having the water level is snieiently low and being therein an opening and :i step therein :it

so related to the plane 0i' the promenade the end 0f said aisle, anfl :i bulkhead to seal l0 floor at the outer encl of one aisle that it said opening and eoinprieingai vertical web differs from the level of the promenade floor at the inner time of Said Wall und a top of to Such :1n extent as te require un inter1nethe fiume Width ne the top of Said Wall.

cliate step, a. Water retaining' wall separating JHN FRANKLIN W'HITMAN. 

